English
中文
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How Does a HEPA Filter Work?
HEPA filters capture particles through four mechanisms: interception, gravitational settling, airflow vortices, and van der Waals forces.
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What Are the Main Filter Media Used in Air Purifiers?
Common air-purifier filter media include HEPA filters, photocatalysts, activated carbon, and negative-ion generators, each serving a different purpose.
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How Often Should Air Purifier Filters Be Replaced?
Typical replacement intervals are 6–12 months for HEPA filters, 3–6 months for activated-carbon filters, and about one year for photocatalytic filters.
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When Should an Air Purifier Filter Be Replaced?
A HEPA filter can be assessed by comparing airflow and PM2.5 removal performance with its initial values and by observing changes in filter color.
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Filter Efficiency and Air Resistance Are What Matter Most
Rather than chasing the highest HEPA grade, consider filtration efficiency, airflow resistance, media area, and activated-carbon weight when choosing a filter.
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Why Do Homes with Pets Need an Air Purifier?
Pet hair, dander, saliva proteins, odors, parasites, germs, dust mites, and other pollutants can degrade indoor air and trigger discomfort or allergies.
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How Can Air Purifiers Remove Viruses?
This article compares ozone, ultraviolet light, electrostatic collection, and high-efficiency filter media as technologies used to address airborne viruses.
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How Should You Interpret an Air Purifier's CADR?
CADR indicates how quickly an air purifier delivers clean air, but it has important limits and should be considered together with CCM and other factors.
Company landline
010-60770969
Sales Phone/WeChat: 15601000090
Purchasing Management/WeChat: 13331060986
Company Phone: 010-60770969
Address: Room 1708, Building B, Jinyu International Center, Longyu East 1st Road, Huilongguan Street, Changping District, Beijing
©2026 Kelan Filtration Technology(Beijing) Group Co., Ltd. All rights reserved
Record Number: Jing ICP No. 2022016037-2
Technical Support: Suyuan Network
Sales Phone/WeChat: 15601000090
Purchasing Management/WeChat: 13331060986
Company Phone: 010-60770969
Address: Room 1708, Building B, Jinyu International Center, Longyu East 1st Road, Huilongguan Street, Changping District, Beijing
©2026 Copyright Beijing Kelan Fresh Air Technology Co., Ltd. All rights reserved
Record Number: Jing ICP No. 2022016037-2
Technical Support: Suyuan Network
